Poorly constructed mobile scaffolding observed on the roof top.  Castors of the scaffolding positioned unsafely close to the edge of drainage channel. Action: Advised the contractor to resume the activity after making necessary rectifications including replacement of castors by base plates and getting it inspected by a competent scaffolding inspector. Compliance with CoP 26.0 of OHAD SF to be ensured.
Hazard category: Unsafe working platforms / scaffolds